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Earnings (Loss) Per Share Loss Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
Our calculations for basic and dilutive earnings (loss) per share for the years ended December 31, 2018, 2017, and 2016 are as follows:
    
(dollars in millions, except per share data, shares and stock units in thousands)
 
2018
 
2017
 
2016
Basic and dilutive net income (loss) available to common shareholders
 
$
20.2

 
$
(10.8
)
 
$
21.5

 
 
 
 
 
 
 
Basic weighted average shares outstanding
 
32,983

 
32,685

 
32,416

Effect of dilutive securities:
 
 
 
 
 
 
Unvested shares and stock units(a)
 
876

 
—

 
624

Dilutive weighted average shares outstanding
 
33,859

 
32,685

 
33,040

 
 
 
 
 
 
 
Basic earnings (loss) per share(b)
 
$
0.61

 
$
(0.33
)
 
$
0.66

Diluted earnings (loss) per share(b)
 
$
0.60

 
$
(0.33
)
 
$
0.65

(a) Includes unvested shares of Common Stock, unvested stock units, and vested stock units for which the underlying Common Stock has not been distributed.
(b) Earnings (loss) per share is based on unrounded figures and not the rounded figures presented.
Schedule of Antidilutive Securities
Our anti-dilutive securities for the years ended December 31 are as follows:

(shares in thousands)
2018
2017
2016
Anti-dilutive unvested shares and options
51

8

196